eagles {MASS} | R Documentation

## Foraging Ecology of Bald Eagles

### Description

Knight and Skagen collected during a field study on the foraging behaviour of wintering Bald Eagles in Washington State, USA data concerning 160 attempts by one (pirating) Bald Eagle to steal a chum salmon from another (feeding) Bald Eagle.

### Usage

    data(eagles)

### Format

The `eagles` data frame has 8 rows and 5 columns.

`y`
  Number of successful attempts.
`n`
  Total number of attempts.
`P`
  Size of pirating eagle (`L` = large, `S` = small).
`A`
  Age of pirating eagle (`I` = immature, `A` = adult).
`V`
  Size of victim eagle (`L` = large, `S` = small).

### Source

Knight, R. L. and Skagen, S. K. (1988) Agonistic asymmetries and the foraging ecology of Bald Eagles. Ecology 69, 1188–1194.

### References

Venables, W. N. and Ripley, B. D. (1999) Modern Applied Statistics with S-PLUS. Third Edition. Springer.

### Examples

    eagles.glm <- glm(cbind(y, n - y) ~ P*A + V, data = eagles,
                      family = binomial)
    dropterm(eagles.glm)
    prof <- profile(eagles.glm)
    plot(prof)
    pairs(prof)

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